WO2023097789A1 - Écran d'affichage et son procédé de préparation et appareil d'affichage - Google Patents

Écran d'affichage et son procédé de préparation et appareil d'affichage Download PDF

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Publication number
WO2023097789A1
WO2023097789A1 PCT/CN2021/138371 CN2021138371W WO2023097789A1 WO 2023097789 A1 WO2023097789 A1 WO 2023097789A1 CN 2021138371 W CN2021138371 W CN 2021138371W WO 2023097789 A1 WO2023097789 A1 WO 2023097789A1
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WIPO (PCT)
Prior art keywords
substrate
liquid crystal
electrode layer
ultraviolet light
display area
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PCT/CN2021/138371
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English (en)
Chinese (zh)
Inventor
邓茜
程薇
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武汉华星光电技术有限公司
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Priority to US17/597,295 priority Critical patent/US20230176425A1/en
Publication of WO2023097789A1 publication Critical patent/WO2023097789A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1323—Arrangements for providing a switchable viewing angle
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
    • G02F1/13345—Network or three-dimensional gels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133512—Light shielding layers, e.g. black matrix
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1339—Gaskets; Spacers; Sealing of cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/13439—Electrodes characterised by their electrical, optical, physical properties; materials therefor; method of making
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells

Definitions

  • the present application relates to the field of display technology, in particular to a display panel, a manufacturing method thereof, and a display device.
  • Adding a dimming liquid crystal cell to control the viewing angle on one side of the conventional display liquid crystal cell can make the display panel freely switch between the private mode with a narrow viewing angle and the sharing mode with a wide viewing angle.
  • the polymer liquid crystal in the dimming liquid crystal cell is usually prepared by liquid crystal dripping or pouring. Therefore, it is necessary to solidify the polymer monomer and the liquid crystal miscible to form a polymer network. Because the polymer monomer and the frame The intensity of ultraviolet light required for the curing of the glue is different. In order to ensure the dimming characteristics of the polymer monomer and prevent the puncture of the liquid crystal, the curing of the polymer monomer must be carried out before the curing of the frame glue; During the curing process, an ultraviolet light mask can be added on one side of the dimming liquid crystal box to block the ultraviolet light and prevent the ultraviolet light from irradiating the polymer monomer and causing early exposure during the curing process of the frame glue. Diffraction will occur at the edge of the photomask, and the diffracted light and the polymer monomer adjacent to the frame glue will cause crosslinking reaction to occur in advance, resulting in uneven distribution of internal haze after the polymer monomer is cured.
  • the embodiments of the present application provide a display panel, its preparation method, and a display device, so as to solve the problem that when the existing display panel uses an ultraviolet light mask to cure the frame glue, the ultraviolet light will be diffracted at the edge of the mask, and the diffracted light irradiation
  • the polymer monomer located adjacent to the sealant will cause its cross-linking reaction to occur in advance, which will cause the technical problem of uneven distribution of internal haze after the polymer monomer is cured.
  • the present application provides a display panel, which includes a display body and a dimming liquid crystal cell arranged on one side of the display body.
  • the dimming liquid crystal cell includes a display area and a sealant area surrounding the display area.
  • LCD box includes:
  • a dimming liquid crystal layer disposed between the first substrate and the second substrate and located in the display area, the dimming liquid crystal layer includes a polymer network and liquid crystal molecules distributed in the polymer network; as well as
  • a sealant layer disposed between the first substrate and the second substrate and located in the sealant area
  • the ultraviolet transmittance of the first substrate in the display area is less than a preset threshold, and the ultraviolet transmittance of the second substrate in the display area is greater than or equal to the preset threshold.
  • the first substrate includes:
  • the first electrode layer is arranged on the side of the first substrate close to the dimming liquid crystal layer;
  • the second substrate includes:
  • the second electrode layer is disposed on a side of the second substrate close to the dimming liquid crystal layer
  • the ultraviolet light transmittance of the first electrode layer in the display area is less than the preset threshold, and the ultraviolet light transmittance of the second electrode layer in the display area is greater than or equal to the preset threshold. threshold.
  • the orthographic projection of the first electrode layer on the first substrate has a first edge, and the orthographic projection of the sealant layer on the first substrate is close to the display panel.
  • One side of the zone has a second edge, the first edge and the second edge coincident.
  • the preset threshold is greater than 10% and less than or equal to 70%.
  • the ultraviolet light transmittance of the first electrode layer in the display area is less than or equal to 10%, and the ultraviolet light transmittance of the second electrode layer in the display area is greater than or equal to 10%. Equal to 70%.
  • the visible light transmittance of the first electrode layer in the display area is greater than 80%, and the visible light transmittance of the second electrode layer in the display area is greater than 90%.
  • the material of the first electrode layer includes one or more of zinc oxide, aluminum-doped zinc oxide, zinc oxide/indium tin oxide, and indium tin oxide/zinc oxide/indium tin oxide ;
  • the material of the second electrode layer includes one or more of indium tin oxide and indium oxide.
  • the first substrate includes:
  • the first electrode layer is disposed on a side of the first substrate close to the dimming liquid crystal layer;
  • an ultraviolet light shielding layer disposed on one side of the first substrate and located in the display area;
  • the second substrate includes:
  • the second electrode layer is disposed on a side of the second substrate close to the dimming liquid crystal layer
  • the ultraviolet light transmittance of the first electrode layer in the display area is greater than or equal to the preset threshold
  • the ultraviolet light transmittance of the second electrode layer in the display area is greater than or equal to the preset threshold. preset threshold.
  • the ultraviolet light shielding layer is arranged on the side of the first substrate away from the dimming liquid crystal layer; or, the ultraviolet light shielding layer is arranged on the first substrate and the between the first electrode layers; or, the ultraviolet light shielding layer is disposed on a side of the first electrode layer away from the first substrate.
  • the material of the first electrode layer includes one or more of indium tin oxide and indium oxide
  • the material of the second electrode layer includes one of indium tin oxide and indium oxide or more.
  • the present application provides a display device, including a display panel and a backlight module, and the backlight module is arranged on the side of the display body away from the dimming liquid crystal cell;
  • the display panel includes a display body and is arranged on the Display a dimming liquid crystal cell on one side of the main body, the dimming liquid crystal cell includes a display area and a sealant area surrounding the display area, the dimming liquid crystal cell includes:
  • a dimming liquid crystal layer disposed between the first substrate and the second substrate and located in the display area, the dimming liquid crystal layer comprising a polymer network and liquid crystal molecules distributed in the polymer network,
  • the liquid crystal molecules are nematic liquid crystal compositions, and the nematic liquid crystal compositions include any one or a mixture of acrylates, methacrylates, styryls and diacetyls; as well as
  • a sealant layer disposed between the first substrate and the second substrate and located in the sealant area
  • the ultraviolet transmittance of the first substrate in the display area is less than a preset threshold, and the ultraviolet transmittance of the second substrate in the display area is greater than or equal to the preset threshold.
  • the first substrate includes:
  • the first electrode layer is arranged on the side of the first substrate close to the dimming liquid crystal layer;
  • the second substrate includes:
  • the second electrode layer is disposed on a side of the second substrate close to the dimming liquid crystal layer
  • the ultraviolet light transmittance of the first electrode layer in the display area is less than the preset threshold, and the ultraviolet light transmittance of the second electrode layer in the display area is greater than or equal to the preset threshold. threshold.
  • the orthographic projection of the first electrode layer on the first substrate has a first edge
  • the orthographic projection of the sealant layer on the first substrate is close to the display
  • One side of the zone has a second edge, the first edge and the second edge coincident.
  • the preset threshold is greater than 10% and less than or equal to 70%.
  • the ultraviolet light transmittance of the first electrode layer in the display area is less than or equal to 10%, and the ultraviolet light transmittance of the second electrode layer in the display area is greater than or equal to 10%. Equal to 70%.
  • the visible light transmittance of the first electrode layer in the display area is greater than 80%, and the visible light transmittance of the second electrode layer in the display area is greater than 90%.
  • the first substrate includes:
  • the first electrode layer is disposed on a side of the first substrate close to the dimming liquid crystal layer;
  • an ultraviolet light shielding layer disposed on one side of the first substrate and located in the display area;
  • the second substrate includes:
  • the second electrode layer is disposed on a side of the second substrate close to the dimming liquid crystal layer
  • the ultraviolet light transmittance of the first electrode layer in the display area is greater than or equal to the preset threshold
  • the ultraviolet light transmittance of the second electrode layer in the display area is greater than or equal to the preset threshold. preset threshold.
  • the ultraviolet light shielding layer is arranged on the side of the first substrate away from the dimming liquid crystal layer; or, the ultraviolet light shielding layer is arranged on the first substrate and the between the first electrode layers; or, the ultraviolet light shielding layer is disposed on a side of the first electrode layer away from the first substrate.
  • the material of the first electrode layer includes one or more of zinc oxide, aluminum-doped zinc oxide, zinc oxide/indium tin oxide, and indium tin oxide/zinc oxide/indium tin oxide ;
  • the material of the second electrode layer includes one or more of indium tin oxide and indium oxide.
  • the present application provides a method for preparing a display panel, comprising the following steps:
  • a first substrate and a second substrate are provided, a sealant layer is formed between the first substrate and the second substrate, and the sealant layer is located in the sealant area of the dimming liquid crystal cell;
  • the ultraviolet light mask is located on the side of the first substrate away from the second substrate, and irradiates the dimming liquid crystal cell with ultraviolet light to cure the sealant layer , wherein, the shading area of the ultraviolet light mask corresponds to the display area;
  • a display main body is provided, and the display main body and the dimming liquid crystal cell are assembled to form the display panel.
  • the beneficial effect of the present application is: the display panel and its preparation method and display device provided by the present application, by making the ultraviolet light transmittance of the first substrate in the display area less than a preset threshold, when the ultraviolet light is far away from the first substrate from the second When one side of the substrate is irradiated to cure the sealant layer, due to the low UV transmittance of the first substrate, the intensity of the diffracted light at the edge of the UV mask passing through the first substrate cannot reach that of the polymer liquid crystal mixture.
  • the cross-linking reaction of the pre-polymerized molecules in the polymer network can prevent the pre-polymerized molecules from being exposed in advance during the curing process of the frame glue, which is conducive to improving the uniformity of the haze distribution in the liquid crystal dimming box; in addition, the first The ultraviolet light transmittance of the second substrate in the display area is greater than the preset threshold value.
  • the ultraviolet light can pass through the second substrate with low loss and irradiate the pre-polymerized molecules, which can make the pre-polymerized molecules undergo a cross-linking reaction to form a polymer network, so as to realize the anti-peeping performance of the display panel.
  • FIG. 1 is a schematic cross-sectional structure diagram of a display panel provided by an embodiment of the present application
  • Fig. 2A is a schematic cross-sectional structure diagram of the first dimming liquid crystal cell provided in the embodiment of the present application;
  • FIG. 2B is a schematic top view of the dimming liquid crystal cell in FIG. 2A;
  • 3A is a schematic diagram of the curve relationship between the ultraviolet wavelength and the ultraviolet light transmittance of the first electrode layer and the second electrode layer;
  • Fig. 3B is a schematic diagram of the curve relationship between the wavelength of ultraviolet light and the transmittance of ultraviolet light of different materials
  • Fig. 4A is a schematic cross-sectional structure diagram of a second dimming liquid crystal cell provided in the embodiment of the present application.
  • FIG. 4B is a schematic top view of the dimming liquid crystal cell in FIG. 4A;
  • Fig. 5 is a schematic cross-sectional structure diagram of a third dimming liquid crystal cell provided in an embodiment of the present application.
  • Fig. 6 is a schematic cross-sectional structure diagram of a fourth dimming liquid crystal cell provided in an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of a method for manufacturing a display panel provided in an embodiment of the present application.
  • FIGS. 7A to 7E are schematic flow charts of a method for manufacturing a display panel provided in an embodiment of the present application.
  • Display main body 2. Dimming liquid crystal box; 2a, display area; 2b, frame glue area; 3. UV mask; 4. First polarizer; 5. Second polarizer;
  • Second substrate 221. Second substrate; 222. Second electrode layer; 223. Second alignment layer;
  • Fig. 1 is a schematic cross-sectional structure diagram of a display panel provided in the embodiment of the present application
  • Fig. 2A is a cross-sectional view of the first dimming liquid crystal cell provided in the embodiment of the present application Structural schematic diagram
  • FIG. 2B is a top view structural schematic diagram of the dimming liquid crystal cell in FIG. 2A.
  • the display panel provided in the embodiment of the present application includes a display body 1 and a dimming liquid crystal cell 2 arranged on one side of the display body 1.
  • the display body 1 can be a display liquid crystal cell, and the dimming liquid crystal cell 2 is used to control
  • the deflection direction of the light emitted from the display main body 1 enables the display panel to selectively transmit light at different viewing angles, thereby playing the role of anti-peeping at a specific viewing angle, and can also be used in anti-peeping display and Switch between regular displays to improve the usability of the display panel.
  • the dimming liquid crystal cell 2 includes a display area 2a and a sealant area 2b surrounding the display area 2a, and the display area 2a is used for placing a dimming liquid crystal layer 23 for dimming and realizing image display,
  • the frame glue area 2b is used for adhering the frame glue.
  • the dimming liquid crystal cell 2 includes a first substrate 21, a second substrate 22, a dimming liquid crystal layer 23 and a sealant layer 24; the second substrate 22 is arranged opposite to the first substrate 21; the dimming liquid crystal The layer 23 is arranged between the first substrate 21 and the second substrate 22 and is located in the display area 2a, and the dimming liquid crystal layer 23 includes a polymer network 231 and distributed in the polymer network 231 Liquid crystal molecules 232; the sealant layer 24 is disposed between the first substrate 21 and the second substrate 22 and located in the sealant area 2b.
  • the polymer network 231 is formed by cross-linking pre-polymer molecules 233, and the pre-polymer molecules 233 need to be irradiated with sufficient intensity of ultraviolet light to undergo a cross-linking reaction, that is, the first substrate 21 or when the ultraviolet light transmittance of the second substrate 22 needs to be greater than or equal to a preset threshold, the preset threshold is the minimum value of the substrate that allows the prepolymerized molecules 233 to undergo a crosslinking reaction under ultraviolet light irradiation.
  • the ultraviolet light transmittance can make the ultraviolet light intensity of the pre-polymerized molecules 233 reach the reaction threshold of cross-linking reaction, so that the pre-polymerized molecules 233 can undergo cross-linking reactions to form the polymer network 231.
  • the ultraviolet light transmittance of the first substrate 21 in the display area 2a is smaller than the preset threshold, when the ultraviolet light is far from the first substrate 21 to a part of the second substrate 22
  • the sealant layer 24 is cured by side irradiation, since the ultraviolet light transmittance of the first substrate 21 is relatively low, the intensity of the diffracted light at the edge of the ultraviolet mask passing through the first substrate 21
  • the reaction threshold for the crosslinking reaction of the pre-polymerized molecules 233 cannot be reached, so that the pre-polymerized molecules 233 can be prevented from being exposed in advance during the curing process of the sealant layer 24, which is conducive to improving the in-plane
  • the uniformity of haze distribution in addition, the ultraviolet light transmittance of the second substrate 22 in the display area 2a is greater than the preset threshold value, when the ultraviolet light is away from the second substrate 22 from the first substrate When irradiating one side of the liquid crystal molecules 232 to cure the liquid crystal molecules 232, since the second substrate
  • the prepolymer molecules 233 include prepolymer monomers; the liquid crystal molecules 232 are nematic liquid crystal compositions, and the nematic liquid crystal compositions include acrylates, methacrylates, styrene Any one or a mixture of bases and diacetyls.
  • the first electrode layer 212 in the first substrate 21 adopts low ultraviolet light transmittance
  • the electrode layer 212 in the second substrate 22 The second electrode layer 222 adopts a design with high ultraviolet light transmittance, so as to realize that the first substrate 21 has a lower ultraviolet light transmittance in the display area 2a.
  • the first substrate 21 includes a first substrate 211 and the first electrode layer 212, and the first electrode layer 212 is disposed on a side of the first substrate 211 close to the dimming liquid crystal layer 23.
  • the ultraviolet light transmittance of the first electrode layer 212 in the display area 2a is less than the preset threshold, when the ultraviolet light is irradiated from the side of the first substrate 21 away from the second substrate 22 to
  • the intensity of ultraviolet light be greatly reduced, so that the preset threshold cannot be reached, and the reaction threshold for the cross-linking reaction of the pre-polymerized molecules 233 cannot be reached, thereby preventing the pre-polymerized molecules 233 from being exposed in advance, which is conducive to improving the brightness of the dimming liquid crystal.
  • the second substrate 22 includes a second substrate 221 and a second electrode layer 222, the second electrode layer 222 is disposed on the side of the second substrate 221 close to the dimming liquid crystal layer 23, the first
  • the ultraviolet light transmittance of the two electrode layers 222 in the display area 2a is greater than the preset threshold, when the ultraviolet light is irradiated from the side of the second substrate 22 away from the first substrate 21 to
  • the UV light can pass through the second electrode layer 222 with low loss and irradiate the pre-polymerized molecules 233, thereby
  • the reaction threshold for the cross-linking reaction of the pre-polymerization molecules 233 can be reached, and the cross-linking reaction of the pre-polymerization molecules 233 can form the polymer network 231, so as to realize the anti-peeping performance of the display panel.
  • the orthographic projection of the first electrode layer 212 on the first substrate 211 has a first edge 212a
  • the orthographic projection of the sealant layer 24 on the first substrate 211 is close to the display
  • One side of the area 2a has a second edge 24a, and the first edge 212a and the second edge 24a coincide to prevent the first electrode layer 212 from covering the sealant layer 24 and affecting the sealant layer 24 of solidification.
  • the first electrode layer 212 can be processed through a yellow light process, so that the part of the first electrode layer 212 located in the sealant area 2b is developed and etched away, so that the The ultraviolet light irradiated on the side of the first substrate 21 away from the second substrate 22 can irradiate the sealant layer 24; wherein, the photomask for processing the first electrode layer 212 and the sealant layer 24.
  • the same photomask can be used for the ultraviolet light mask for curing treatment, which is beneficial to save the process and reduce the cost.
  • the preset threshold is greater than 10% and less than or equal to 70%.
  • the ultraviolet light transmittance of the first electrode layer 212 in the display area 2a in order to ensure that the ultraviolet light transmitted through the first electrode layer 212 is not enough to cause the crosslinking reaction of the prepolymerized molecules 233, the ultraviolet light transmittance of the first electrode layer 212 in the display area 2a
  • the second electrode layer 222 in the ultraviolet light of the display area 2a The light transmittance is greater than or equal to 70%.
  • the visible light transmittance of the first electrode layer 212 in the display area 2a is greater than 80%, and the visible light transmittance of the second electrode layer 222 in the display area 2a is greater than 90%, so as to ensure the Both the first electrode layer 212 and the second electrode layer 222 have relatively high visible light transmittance in the display area 2a, thereby ensuring that the first substrate 21 and the second substrate 22 are in the display area 2a.
  • Both 2a have a relatively high visible light transmittance, so that the dimmable liquid crystal cell 2 has a relatively high visible light transmittance when performing dimming display, which is beneficial to improve the display effect.
  • the first electrode layer 212 is made of a conductive material with a low ultraviolet light transmittance
  • the second electrode layer 222 is made of a conductive material with a high ultraviolet light transmittance.
  • the material of the first electrode layer 212 includes one or more of zinc oxide, aluminum-doped zinc oxide, zinc oxide/indium tin oxide, and indium tin oxide/zinc oxide/indium tin oxide, wherein, The mass fraction of aluminum doped in aluminum-doped zinc oxide is 1%-5%; the material of the second electrode layer 222 includes one or more of indium tin oxide and indium oxide.
  • FIG. 3A is a schematic diagram of the curve relationship between the ultraviolet wavelength and the ultraviolet light transmittance of the first electrode layer and the second electrode layer; it should be noted that the first electrode layer 212 is made of indium tin oxide/ Zinc oxide/indium tin oxide stack, the second electrode layer 222 uses indium tin oxide; generally, the wavelength of ultraviolet light is less than 400 nanometers, and as the wavelength of ultraviolet light increases, the ultraviolet light of the first electrode layer 212 is transparent Transmittance shows an increasing trend, and the ultraviolet light transmittance of the second electrode layer 222 is greater than 70%.
  • the ultraviolet light transmittance of the first electrode layer 212 and the second electrode layer 222 The gap is relatively large; specifically, when the wavelength of ultraviolet light is 365 nanometers, the ultraviolet light transmittance of the first electrode layer 212 is less than 10%, and the ultraviolet light transmittance of the second electrode layer 222 is greater than 90%, At this time, the difference between the ultraviolet light transmittance of the first electrode layer 212 and the second electrode layer 222 is the largest.
  • Figure 3B is a schematic diagram of the curve relationship between the wavelength of ultraviolet light and the transmittance of ultraviolet light of different materials; it should be noted that when the wavelength of ultraviolet light is 365 nanometers, the ultraviolet light of indium tin oxide Transmittance>UV transmittance of nickel oxide>UV transmittance of aluminum-doped zinc oxide>UV transmittance of zinc oxide, therefore, preferably, when the wavelength of ultraviolet light is 365 nanometers, the first The material of the first electrode layer 212 may be zinc oxide, and the material of the second electrode layer 222 may be indium tin oxide, so as to better meet different requirements of ultraviolet light transmittance.
  • the thickness of the first electrode layer 212 ranges from 100 nanometers to 1000 nanometers, for example, 100 nanometers, 300 nanometers, 500 nanometers, and 1000 nanometers.
  • the thickness of the indium tin oxide/zinc oxide/indium tin oxide laminate can be 150 nanometers/80 nanometers/300 nanometers respectively.
  • the thickness of the second electrode layer 222 ranges from 50 nanometers to 1000 nanometers, such as 50 nanometers, 100 nanometers, 300 nanometers, and 1000 nanometers.
  • the ultraviolet light shielding layer 213 is added on the first substrate 21 to realize the lower ultraviolet light transmittance of the first substrate 21 in the display area 2a.
  • the above functions can be realized without changing the material of the first electrode layer 212 .
  • the first substrate 21 includes a first substrate 211, a first electrode layer 212 and an ultraviolet light shielding layer 213, and the first electrode layer 212 is disposed on the first substrate 211 close to the dimming liquid crystal.
  • One side of the layer 23, the ultraviolet shielding layer 213 is arranged on one side of the first substrate 211 and is located in the display area 2a; The light transmittance is greater than or equal to the preset threshold value.
  • the ultraviolet light is irradiated from the side of the first substrate 21 away from the second substrate 22 to cure the sealant layer 24, due to the ultraviolet light Most of the diffracted light at the edge of the mask is blocked by the ultraviolet light shielding layer 213, and cannot be irradiated to the dimming liquid crystal layer 23, so that the intensity of ultraviolet light irradiated on the dimming liquid crystal layer 23 is reduced, and cannot reach the desired level.
  • the reaction threshold of the cross-linking reaction of the pre-polymerized molecules 233 can be avoided, thereby preventing the pre-polymerized molecules 233 from being exposed in advance, which is conducive to improving the uniformity of the haze distribution in the plane of the dimming liquid crystal cell 2 .
  • the second substrate 22 includes a second substrate 221 and a second electrode layer 222, and the ultraviolet light transmittance of the second electrode layer 222 disposed in the display area 2a is greater than or equal to that of the prepolymerized molecules 233 is the reaction threshold of the crosslinking reaction.
  • the material of the first electrode layer 212 includes one or more of indium tin oxide and indium oxide
  • the material of the second electrode layer 222 includes indium tin oxide and indium oxide one or more of.
  • the ultraviolet light shielding layer 213 is disposed on a side of the first substrate 211 away from the dimming liquid crystal layer 23 .
  • the ultraviolet light shielding layer 213 is disposed on the side of the first substrate 211 close to the dimming liquid crystal layer 23, for example, please refer to FIG. 5, the difference between FIG. 5 and FIG. 4A In that, the ultraviolet light shielding layer 213 is disposed between the first substrate 211 and the first electrode layer 212; for another example, please refer to FIG. 6, the difference between FIG. 6 and FIG. 4A is that the The ultraviolet light shielding layer is disposed on a side of the first electrode layer 212 away from the first substrate 211 .
  • the orthographic projection of the ultraviolet light shielding layer 213 on the first substrate 211 has a third edge 213a
  • the sealant layer 24 is on the first substrate 211
  • the side of the orthographic projection close to the display area 2a has a second edge 24a, the third edge 213a coincides with the second edge 24a, so as to prevent the ultraviolet light shielding layer 213 from blocking the sealant layer 24 It affects the curing of the sealant layer 24 .
  • the first substrate 21 also includes a first alignment layer 214
  • the second substrate 22 also includes a second alignment layer 223
  • the first alignment layer 214 is disposed on the side of the first substrate 211 close to the dimming liquid crystal layer 23
  • the second alignment layer 223 is disposed on the second substrate 221 close to the dimming liquid crystal layer 23
  • the first alignment layer 214 and the second alignment layer 223 are used to provide alignment directions for the liquid crystal molecules 232 .
  • the first alignment layer 214 is disposed on the side of the first electrode layer 212 close to the dimming liquid crystal layer 23, and the second alignment layer 223 is disposed on the side of the second electrode layer 222 close to the One side of the dimming liquid crystal layer 23; or, the first alignment layer 214 is disposed on the side of the ultraviolet shielding layer close to the dimming liquid crystal layer 23, and the second alignment layer 223 is disposed on the first The side of the second electrode layer 222 is close to the dimming liquid crystal layer 23 .
  • the display panel further includes a first polarizer 4 and a second polarizer 5 , the first polarizer 4 is arranged on one side of the display body 1 , and the second polarizer 5 is disposed on the side of the dimming liquid crystal layer 23 away from the first polarizer 4, and the optical axis direction of the first polarizer 4 is parallel to the optical axis direction of the second polarizer 5; wherein, The polymer network 231 is arranged along a first direction w, and the first direction w is inclined relative to the normal of the first polarizer 4 .
  • the dimming liquid crystal layer 23 is used in the anti-peeping display mode, so that the incident light along the normal direction z of the first polarizer 4 passes through the second polarizer 5, and makes the The incident light obliquely to the normal direction z of the first polarizer 4 is blocked or partially blocked by the second polarizer 5;
  • One direction is different, so that more light can pass through the second polarizer 5, so as to improve the viewing angle range of the display panel in the normal display mode, so that the viewing angle of the display panel in the normal display mode is larger than The viewing angle of the display panel in the anti-peeping display mode.
  • the embodiment of the present application also provides a display device, the display device includes the display panel and a backlight module in the above embodiment, and the backlight module is arranged on the display body 1 away from the dimming liquid crystal cell 2 One side is used to provide a backlight for the display main body 1 .
  • Figure 7 is a schematic flow chart of a method for preparing a display panel provided by an embodiment of the present application
  • Figure 7A to Figure 7E is a method for preparing a display panel provided by an embodiment of this application Schematic diagram of the process structure
  • the embodiment of the present application also provides a method for preparing a display panel, including the following steps:
  • the sealant layer 24 can be formed on the first substrate 21 or the second substrate 22 by using a coating process; after that, the first substrate 21 and the The second substrate 22 is paired with the case.
  • the polymer liquid crystal mixture can be injected between the first substrate 21 and the second substrate 22 using a dripping or pouring process, and the polymer liquid crystal mixture includes a plurality of liquid crystals. molecule 232 and a plurality of prepolymerized molecules 233 .
  • S30 Provide an ultraviolet light mask 3, the ultraviolet light mask 3 is located on the side of the first substrate 21 away from the second substrate 22, and irradiates the dimming liquid crystal cell 2 with ultraviolet light to The sealant layer 24 is cured, wherein the light-shielding area of the ultraviolet mask 3 corresponds to the display area 2a.
  • ultraviolet light is irradiated to the dimming liquid crystal cell 2 from the side of the ultraviolet light mask 3 away from the first substrate 21 , because the first substrate 21 is in the display area.
  • the ultraviolet light transmittance of 2a is less than the preset threshold, and the preset threshold is the minimum ultraviolet light transmittance of the substrate on which the pre-polymerized molecules 233 undergo a crosslinking reaction under ultraviolet light irradiation, because the first The ultraviolet light transmittance of the substrate 21 is low, and the intensity of the diffracted light passing through the first substrate 21 at the edge of the ultraviolet light mask 3 cannot reach the reaction threshold of the crosslinking reaction of the prepolymerized molecules 233, so Preventing the pre-polymerized molecules 233 from being exposed in advance is beneficial to improving the uniformity of the in-plane haze distribution of the polymer liquid crystal.
  • the ultraviolet light mask 3 can only be set corresponding to the display area 2a, at this time, the ultraviolet light mask 3 only includes the light shielding area; the ultraviolet light mask 3 can also correspond to the entire
  • the light-adjustable liquid crystal cell 2 is set, specifically, the ultraviolet light mask 3 includes a light-shielding area and a light-transmitting area, wherein the light-shielding area corresponds to the display area 2a, and the light-transmitting area corresponds to the sealant area 2b.
  • the ultraviolet light transmittance of the second substrate 22 in the display area 2a is greater than the preset threshold, and a specific voltage is applied to the dimming liquid crystal cell 2 so that the liquid crystal molecules 232 deflection at a specific angle, during the application of voltage, ultraviolet light is irradiated from the side of the second substrate 22 away from the first substrate 21 to cause a cross-linking reaction of the pre-polymerized molecules 233 to form a polymer network 231, In order to realize the anti-peeping performance of the display panel.
  • S50 providing a display body, assembling the display body and the dimming liquid crystal cell 2 to form the display panel.
  • the display body may be a display liquid crystal cell, and the display body may be located on the upper side or the lower side of the dimming liquid crystal cell 2 , which is not limited in this embodiment of the present application.
  • the beneficial effect is: the display panel and its preparation method and display device provided by the embodiments of the present application, by making the ultraviolet light transmittance of the first substrate in the display area less than a preset threshold, when the ultraviolet light is far away from the first substrate from the second substrate
  • a preset threshold when one side of the UV light mask is irradiated to cure the sealant layer, due to the low UV transmittance of the first substrate, the intensity of the diffracted light at the edge of the UV mask passing through the first substrate cannot reach that of the polymer liquid crystal mixture.
  • the reaction threshold of the polymer network formed by the cross-linking reaction of the pre-polymerized molecules can prevent the pre-polymerized molecules from being exposed in advance during the curing process of the sealant, which is conducive to improving the uniformity of the haze distribution in the liquid crystal dimming box; in addition, the second The ultraviolet light transmittance of the substrate in the display area is greater than the preset threshold value. Higher, the ultraviolet light can pass through the second substrate with low loss to irradiate the pre-polymerized molecules, which can cause the pre-polymerized molecules to undergo a cross-linking reaction to form a polymer network, so as to realize the anti-peeping performance of the display panel.

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  • Physics & Mathematics (AREA)
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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

La présente invention concerne un écran d'affichage et son procédé de préparation, et un appareil d'affichage. Une boîte à cristaux liquides de gradation (2) de l'écran d'affichage comprend un premier substrat (21), un second substrat (22), une couche de cristaux liquides de gradation (23) et une couche d'étanchéité (24), le facteur de transmission des ultraviolets du premier substrat (21) dans une zone d'affichage (2a) étant inférieur à une valeur seuil prédéfinie, et le facteur de transmission des ultraviolets du second substrat (22) dans la zone d'affichage (2a) étant supérieur ou égal à la valeur seuil prédéfinie, de telle sorte que, pendant un processus de durcissement de la couche d'étanchéité (24), des molécules de pré-polymérisation (233) peuvent être empêchées d'être exposées à l'avance, et les molécules de pré-polymérisation (233) peuvent être soumises à une réaction de réticulation pendant le durcissement, de manière à former un réseau polymère (231).
PCT/CN2021/138371 2021-12-03 2021-12-15 Écran d'affichage et son procédé de préparation et appareil d'affichage WO2023097789A1 (fr)

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